Dr Fink's fibre consists of a hollow rod of an insulating polycarbonate material with a 30-micrometre ring of a piezoelectric polymer running along its length.
The safety switch comprises a heat transfer piece, an insulating seat, a fusible body, a control rod and a movable safety piece.
该保险开关，它包括一热传递片、一绝缘座、一可熔体、一控制杆以及一动保险片。
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The movable safety piece is connected with the insulating system, is supported against by the control rod, and is in normally closed connection with the fixed contact piece.